See Also

Managing Dispatch Sources

DispatchSource provides an interface for monitoring low-level system objects such as Mach ports, Unix descriptors, Unix signals, and VFS nodes for activity and submitting event handlers to dispatch queues for asynchronous processing when such activity occurs.

A dispatch source that monitors a Mach port for dead name notifications, indicating that a send right no longer has any corresponding receive right. The handle is a Mach port with a send or send-once right (mach_port_t).